The Synchron classic features a new compression molded eva midsole which is current in most modern running shoes. The dual density construction remains true to the original version from the early 90s. The upper materials have been improved to premium pigskin suede from synthetic overlays while the original mesh apperarance remains true to the era. To modernisze the silhouette, Karhu makes the air cushion technology both visible and functional in the ousole. Most importantly Karhu keeps the unique Syncrhon lacing structure which serves as a way to tighetn the forefront upon repeated use.